Improved closed refrigeration and heat dissipation SVG (Static Var Generator) device

Abstract

The utility model relates to the technical field of equipment heat dissipation, and discloses an improved closed refrigeration heat dissipation SVG device, which comprises a plurality of SVG electric appliance cabinets arranged indoors, power cabinet heat exchange units arranged on the SVG electric appliance cabinets, and a condensing unit arranged outdoors, sVG power modules are installed in the SVG electric appliance cabinets; the power cabinet heat exchange unit comprises a heat exchange box connected with an air inlet of the SVG electric appliance cabinet and a centrifugal fan connected with an air outlet of the SVG electric appliance cabinet; an air outlet of the centrifugal fan is connected with the heat exchange box through a pipeline; the heat exchange box is connected with a condensing unit pipeline. According to the device, the SVG power module is arranged in the relatively closed SVG electric appliance cabinet, so that the SVG power module is isolated from the external space and is prevented from being eroded and damaged by water vapor, dust and the like in the atmosphere; and the centrifugal fan and the heat exchange box are matched with the outdoor condensing unit to form a refrigeration cooling system of the SVG electric appliance cabinet, so that the temperature in the SVG electric appliance cabinet meets ideal working conditions of the SVG power module.

Description

Technical Field

[0001] The utility model relates to the technical field of equipment heat dissipation, and particularly relates to an improved airtight refrigeration heat dissipation SVG device. Background Art

[0002] In a small-scale contiguous management distributed photovoltaic power generation system, due to the small power generation scale, geographical dispersion, and large influence of weather conditions, it is easy to cause intermittency and instability of the system, resulting in difficulty in achieving balance of reactive power between regions. Therefore, installing a reactive power compensation device to reasonably regulate the reactive power of the system is of great significance for the stable operation of the power grid. With the development of power electronic technology, the power electronic reactive power generator (SVG) with the characteristics of flexibility and high efficiency has gradually replaced the traditional static var compensator (SVC) and synchronous compensator (STATCOM). SVG uses power electronic devices (such as insulated gate bipolar transistors IGBT, etc.) and a control system to achieve rapid response and precise control of functions such as reactive power compensation, harmonic suppression, reduction of voltage fluctuations and flicker, and solution of three-phase unbalance, and compensates the reactive power in the power grid by adjusting the phase of the current or voltage. By adjusting its output, SVG can generate or absorb reactive power to improve the dynamic performance and stability of the power system.

[0003] However, the heat dissipation problem caused by its own design of SVG is still difficult to be effectively solved, especially prominent in the case of frequent use of IGBT power modules. Nowadays, the design of reactive power compensation devices has become more compact and refined, but the overheating problem of IGBT power modules will be more serious, resulting in a large increase in the high heat flux density. Long-term operation will reduce the insulation performance and service life of the equipment. Therefore, during the use of SVG, the heat dissipation problem of the device needs to be seriously considered, especially for the power electronic components therein, such as IGBT power modules, to ensure its reliability and durability.

[0004] Currently, in order to meet the heat dissipation requirements of SVG, traditional heat dissipation means such as air cooling and water cooling are constantly updated, and new efficient heat dissipation methods emerge in an endless stream. The current commonly used heat dissipation methods mainly include air cooling and water cooling. The pure water cooling device has unique advantages, but it has a large floor area and high cost; forced air cooling is prone to dust accumulation and rust, resulting in damage to electronic components. Therefore, it is particularly important to propose a new heat dissipation method to solve the problems of heat dissipation efficiency, floor area, and heat dissipation cost of the SVG heat dissipation device. Summary of the Utility Model

[0005] Aiming at the problems of thermal efficiency, space occupation, and cost of the existing SVG heat dissipation system, the utility model provides an improved airtight refrigeration heat dissipation SVG device.

[0006] The technical solution adopted by the utility model is as follows:

[0007] An improved closed refrigeration and heat dissipation SVG device includes several SVG electrical cabinets arranged indoors, a power cabinet heat exchange unit installed on the SVG electrical cabinets, and a condensing unit arranged outdoors; several SVG power modules are installed in each SVG electrical cabinet, an air outlet is formed at the top of the cabinet body, and an air inlet is formed at the bottom; the power cabinet heat exchange unit includes a heat exchange box connected to the air inlet of the SVG electrical cabinet through a cold air delivery insulating pipe, and a centrifugal fan connected to the air outlet of the SVG electrical cabinet through a hot air suction insulating pipe; the air outlet of the centrifugal fan is connected to the heat exchange box through a hot air delivery insulating pipe; the heat exchange box is connected to the condensing unit through a pipeline; the heat exchange box and the centrifugal fan cooperate with the condensing unit to form a refrigeration and cooling system for the SVG electrical cabinet.

[0008] Furthermore, the heat exchange box is of a box structure, an evaporator is installed inside it, and the inside of its box body is divided into a cold air chamber and a hot air chamber by the evaporator; among them, the cold air chamber is communicated with the SVG electrical cabinet through a cold air delivery insulating pipe, and the hot air chamber is communicated with the air outlet of the centrifugal fan through a hot air delivery insulating pipe.

[0009] Furthermore, the condensing unit is of a box structure, and a fully enclosed compressor unit, a condenser, a condenser rear condensing fan, a liquid storage tank and a drying filter are installed in the box body; the air inlet of the fully enclosed compressor unit is connected to the exhaust port of the evaporator through a pipeline, the liquid outlet of the fully enclosed compressor unit is connected to the liquid inlet of the condenser through a pipeline, the liquid outlet of the condenser is connected to the liquid inlet of the liquid storage tank through a pipeline, the liquid outlet of the liquid storage tank is connected to the drying filter through a pipeline, and the drying filter is connected to an expansion valve installed at the liquid inlet of the evaporator through a pipeline.

[0010] Furthermore, a control system is also installed indoors. The control system includes a touch screen, a programmable logic controller connected to the touch screen, a relay connected to the programmable logic controller, a sight glass and a solenoid valve installed on the connecting pipeline between the liquid storage tank and the evaporator, and a temperature sensor installed on the connecting pipeline between the fully enclosed compressor unit and the evaporator; the fully enclosed compressor unit, the condenser, the condenser rear condensing fan, the solenoid valve, the evaporator and the centrifugal fan are connected to the relay by wire; the sight glass and the temperature sensor are connected to the touch screen by wire.

[0011] Furthermore, pillar insulators are installed at the four corners of the bottom of the SVG electrical cabinet and the heat exchange box, and the SVG electrical cabinet and the heat exchange box are connected to the ground through the pillars of the pillar insulators.

[0012] Furthermore, the cabinet door of the SVG electrical cabinet adopts a rolling shutter type cabinet door.

[0013] The beneficial effects of the present utility model are:

[0014] 1. The improved sealed refrigeration and heat dissipation SVG device places the SVG power module in a relatively sealed SVG electrical cabinet, isolating the SVG power module from the external space to prevent it from being eroded and damaged by moisture, dust, etc. in the atmosphere. A refrigeration and cooling system for the SVG electrical cabinet is formed by a centrifugal fan, a heat exchange box, and a condensing unit arranged outdoors, so that the temperature inside the SVG electrical cabinet meets the ideal working conditions of the SVG power module.

[0015] 2. On the premise of ensuring the heat dissipation effect, the improved sealed refrigeration and heat dissipation SVG device comprehensively considers the characteristics of project cost, equipment floor area, noise pollution, performance impact, and component temperature rise, and performs better than traditional pure water cooling and forced air cooling. It is of great significance to improve the service life of the SVG power module, reduce the failure rate of the SVG power module, and ensure the stable performance and good operation of the system. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the SVG electrical cabinet of the present utility model arranged indoors;

[0017] Figure 2 It is a schematic diagram of the connection between the SVG electrical cabinet of the present utility model, the centrifugal fan, and the heat exchange box;

[0018] Figure 3 It is a schematic diagram of the condensing unit of the present utility model arranged outdoors;

[0019] Figure 4 It is a schematic diagram of the connection relationship between the internal equipment of the condensing unit of the present utility model and the evaporator;

[0020] Figure 1 In Figure 4, 1 - SVG electrical cabinet, 2 - condensing unit, 3 - SVG power module, 4 - air outlet, 5 - air inlet, 6 - heat exchange box, 7 - centrifugal fan, 8 - cold air delivery insulating pipe, 9 - hot air suction insulating pipe, 10 - hot air delivery insulating pipe, 11 - evaporator, 12 - cold air chamber, 13 - hot air chamber, 14 - fully enclosed compressor unit, 15 - condenser, 16 - condenser rear condensing fan, 17 - liquid storage tank, 18 - expansion valve, 19 - return air pipeline, 20 - liquid supply pipeline, 21 - control system, 22 - sight glass, 23 - solenoid valve, 24 - temperature sensor, 25 - post insulator, 26 - dryer filter. Detailed Embodiment

[0021] The technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0022] This embodiment provides an improved hermetic refrigeration and heat dissipation SVG device. As Figure 1 shown, the improved hermetic refrigeration and heat dissipation SVG device includes three SVG electrical cabinets 1 arranged indoors; as Figure 2 shown, the SVG electrical cabinet 1 is a relatively sealed rectangular box structure, and an installation base plate is formed inside the cabinet body. A plurality of SVG power modules 3 are installed in each SVG electrical cabinet 1, and the SVG power modules 3 are led out through wire passing holes arranged at the rear side or bottom of the cabinet body and connected to other devices.

[0023] As Figure 1 and Figure 2 shown, an air outlet 4 is formed at the top of the cabinet body of the SVG electrical cabinet 1, and an air inlet 5 is formed at the bottom. A heat exchange box 6 is connected to the air inlet 5 of the SVG electrical cabinet 1 through a cold air delivery insulating pipeline 8, and an air outlet 4 is connected to a centrifugal fan 7 through a hot air suction insulating pipeline 9. The air outlet of the centrifugal fan 7 and the heat exchange box 6 are connected through a hot air delivery insulating pipeline 10. The centrifugal fan 7 and the heat exchange box 6 constitute a power cabinet heat exchange unit for each SVG electrical cabinet 1.

[0024] As Figure 3 shown, the improved hermetic refrigeration and heat dissipation SVG device further includes a condensing unit 2 arranged outdoors. The condensing unit 2 is a box structure; as Figure 4 shown, a hermetic compressor unit 14, a condenser 15, a condenser rear condensing fan 16, a liquid storage tank 17, and a drying filter 26 are installed inside the condensing unit 2. The liquid outlet of the hermetic compressor unit 14 is connected to the liquid inlet of the condenser 15 through a pipeline, the liquid outlet of the condenser 15 is connected to the liquid inlet of the liquid storage tank 17 through a pipeline, and the liquid outlet of the liquid storage tank 17 is connected to the drying filter 26 through a pipeline.

[0025] As Figure 2 and Figure 4 shown, the heat exchange box 6 in this embodiment is a box structure, and an evaporator 11 is installed inside it; for the hermetic compressor unit 14 inside the condensing unit 2, its air inlet is connected to the exhaust port of the evaporator 11 through a pipeline, and this pipeline is a return air pipeline 19; the drying filter 26 inside the condensing unit 2 is connected to the expansion valve 18 installed at the liquid inlet of the evaporator 11 through a pipeline, and this pipeline is a liquid supply pipeline 20. The liquid supply pipeline 20 and the return air pipeline 19 extend from indoors through the wall to outdoors.

[0026] In addition, as Figure 2 shown, in the heat exchange box 6 of this embodiment, the interior of the box body is divided by the evaporator 11. After division, a cold air chamber 12 is formed on the left side inside the box body, and a hot air chamber 13 is formed on the right side; the cold air chamber 12 is connected to the SVG electrical cabinet 1 through the cold air delivery insulating pipeline 8, and the hot air chamber 13 is connected to the air outlet of the centrifugal fan 7 through the hot air delivery insulating pipeline 10.

[0027] The working principle of this improved type of airtight refrigeration and heat dissipation SVG device is as follows:

[0028] As Figure 4 shown, after the fully enclosed compressor unit 14 is started, it provides circulating power for the refrigerant stored in the liquid storage tank 17; the fully enclosed compressor can compress the high-temperature gaseous refrigerant discharged from the evaporator 11 and send it into the condenser 15. The condenser 15 cooperates with the condensing fan to cool the refrigerant, and the refrigerant returns to the liquid storage tank 17 in the form of low-temperature liquid; at the same time, the low-temperature liquid refrigerant in the liquid storage tank 17 enters the evaporator 11 through the expansion valve 18.

[0029] As Figure 2 shown, when the SVG power module 3 works, it will generate a certain temperature, causing the temperature inside the SVG electrical cabinet 1 to rise. At this time, the centrifugal fan 7 is started, so that the gas circulates among the centrifugal fan 7, the heat exchange box 6 and the SVG electrical cabinet 1; the centrifugal fan 7 extracts the high-temperature gas and discharges it into the hot air chamber 13 of the heat exchange box 6. The liquid low-temperature refrigerant in the evaporator 11 absorbs the heat of the high-temperature gas, making it form low-temperature gas, and under the suction of the centrifugal fan 7, it returns to the SVG electrical cabinet 1 again. At the same time, the liquid low-temperature refrigerant in the evaporator 11 absorbs heat and forms high-temperature gaseous refrigerant, and returns to the fully enclosed compressor.

[0030] In summary, through the cooperation of the centrifugal fan 7, the heat exchange box 6 and the condensing unit 2 arranged outdoors, a refrigeration and cooling system for the SVG electrical cabinet 1 is formed, so that the temperature inside the SVG electrical cabinet 1 meets the ideal working conditions of the SVG power module 3.

[0031] In addition, as Figure 1 shown, in this embodiment, a control system 21 is also installed indoors. The control system 21 includes a touch screen, a programmable logic controller connected to the touch screen, a relay connected to the programmable logic controller, a liquid sight glass 22 and a solenoid valve 23 installed on the pipeline connecting the liquid storage tank 17 and the evaporator 11, and a temperature sensor 24 installed on the pipeline connecting the fully enclosed compressor unit 14 and the evaporator 11. The fully enclosed compressor unit 14, the condenser 15, the condenser rear condensing fan 16, the solenoid valve 23, the evaporator 11 and the centrifugal fan 7 are connected to the relay by wire; the liquid sight glass 22 and the temperature sensor 24 are connected to the touch screen by wire.

[0032] The temperature of the high-temperature gaseous refrigerant flowing back through the evaporator 11 and the transportation of the low-temperature liquid refrigerant between the liquid storage tank 17 and the evaporator 11 can be understood through the touch screen; signals for starting and stopping can be sent to each device through the touch screen in cooperation with the programmable controller and the relay, thereby realizing intelligent control.

[0033] Furthermore, as a preferred technical solution of this embodiment, considering the safety issues in the use of this improved closed refrigeration and heat dissipation SVG device, such as Figure 1 and Figure 2 shown, in this embodiment, post insulator 25 is installed at the four corners of the bottom of the SVG electrical cabinet 1 and the heat exchange box 6. The SVG electrical cabinet 1 and the heat exchange box 6 are connected to the ground through the posts of the post insulator 25 to ensure the safety of use by means of the post insulator 25. In addition, the SVG electrical cabinet 1 in this embodiment preferably uses a commercially available rolling door type electrical cabinet, which saves space and has better sealing performance compared with the flat door electrical cabinet.

[0034] It should be noted that: the fully enclosed compressor unit 14, condenser 15, condenser rear condensation fan 16, liquid storage tank 17, dryer filter 26, expansion valve 18 and evaporator 11 mentioned in this embodiment are conventional components of an industrial air conditioner and can be purchased commercially according to the required model. The touch screen, programmable controller, relay, liquid sight glass 22, solenoid valve 23 and temperature sensor 24 are all conventional commercially available products, and their manufacturer models are not listed one by one here and can be selected according to the actual engineering requirements.

[0035] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent replacements or changes, and should be covered by the protection scope of the present invention.

Claims

1. An improved hermetic refrigeration and heat dissipation SVG device, characterized in that: It includes several SVG electrical cabinets installed indoors, a power cabinet heat exchange unit installed on the SVG electrical cabinets, and a condensing unit installed outdoors; several SVG power modules are installed in each SVG electrical cabinet, an air outlet is formed at the top of the cabinet body, and an air inlet is formed at the bottom; the power cabinet heat exchange unit includes a heat exchange box connected to the air inlet of the SVG electrical cabinet through a cold air delivery insulating pipeline, and a centrifugal fan connected to the air outlet of the SVG electrical cabinet through a hot air suction insulating pipeline; the air outlet of the centrifugal fan is connected to the heat exchange box through a hot air delivery insulating pipeline; the heat exchange box is connected to the condensing unit through pipelines; the heat exchange box and the centrifugal fan cooperate with the condensing unit to form a refrigeration and cooling system for the SVG electrical cabinet.

2. The improved hermetic refrigeration and heat dissipation SVG device according to claim 1, characterized in that: The heat exchange box is of a box structure, an evaporator is installed inside it, and the inside of its box body is divided into a cold air chamber and a hot air chamber by the evaporator; among them, the cold air chamber is communicated with the SVG electrical cabinet through a cold air delivery insulating pipeline, and the hot air chamber is communicated with the air outlet of the centrifugal fan through a hot air delivery insulating pipeline.

3. The improved hermetic refrigeration and heat dissipation SVG device according to claim 2, wherein: The condensing unit is of a box structure, and a hermetic compressor unit, a condenser, a condenser rear condensing fan, a liquid storage tank and a dryer filter are installed in the box body; the air inlet of the hermetic compressor unit is connected to the exhaust port of the evaporator through pipelines, the liquid outlet of the hermetic compressor unit is connected to the liquid inlet of the condenser through pipelines, the liquid outlet of the condenser is connected to the liquid inlet of the liquid storage tank through pipelines, the liquid outlet of the liquid storage tank is connected to the dryer filter through pipelines, and the dryer filter is connected to an expansion valve installed at the liquid inlet of the evaporator through pipelines.

4. The improved hermetic refrigeration and heat dissipation SVG device according to claim 3, wherein: A control system is also installed indoors. The control system includes a touch screen, a programmable logic controller connected to the touch screen, a relay connected to the programmable logic controller, a sight glass and a solenoid valve installed on the connecting pipeline between the liquid storage tank and the evaporator, and a temperature sensor installed on the connecting pipeline between the hermetic compressor unit and the evaporator; the hermetic compressor unit, the condenser, the condenser rear condensing fan, the solenoid valve, the evaporator and the centrifugal fan are wired to the relay; the sight glass and the temperature sensor are wired to the touch screen.

5. The improved sealed refrigeration and heat dissipation SVG device according to claim 1, characterized in that: Support insulators are installed at the four corners of the bottom of the SVG electrical cabinet and the heat exchange box, and the SVG electrical cabinet and the heat exchange box are connected to the ground through the supports of the support insulators.

6. The improved hermetic refrigeration and heat dissipation SVG device according to claim 1, characterized in that: The cabinet door of the SVG electrical cabinet adopts a rolling shutter door type cabinet door.

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